An Empirical Analysis of the Design Principles for Quantitative and Qualitative Area Symbols     

《制图学和地理信息科学》2013,40(4):271-277

To test the appropriateness of area symbol design principles, this study examined eye fixations on maps that varied in three areas: quantitative or qualitative information, conventional or unconventional design, and chromatic or achromatic presentation. The conventional design of associating darker symbols with greater magnitudes on quantitative maps led to shorter fixation on the map legend, and better performance on the overall map-distribution questions from a memory questionnaire given after the maps were viewed. In contrast, the convention of using pattern or hue symbols on qualitative maps resulted in longer fixation on the map body, and poor performance on the overall map-distribution questions. Some evidence of sex difference was also reported.  相似文献   

Communications From Readers     

《制图学和地理信息科学》2013,40(1):70-74

The peak-pit-pass polygon line-shading procedure partitions any concave polygon into a series of triangles and trapezoids that are shaded independently. These convex subpolygons are identified by processing each vertex of the polygon outline in descending rank order. Alternative actions are initiated whenever a local maximum (peak), a local minimum (pit), or neither (pass) is encountered. Being relatively insensitive to the topology of the polygon and to the density of shade lines while minimizing storage and time requirements, this algorithm achieves a balance between efficiency and flexibility.  相似文献   

'Be Map Aware: Cutting-edge…Not Close to the Edge'     

《The Cartographic journal》2013,50(2):115-116

Abstract

An assessment is made of the accuracy of the map and written survey, which is essentially a list of land-holders and the areas held by each, and of their mutual consistency. The geometry of the map is compared quantitatively with that of the first edition (1852) Ordnance Survey 6-inch (1 : 10 560) map. The Saxton map is found to have a scale of 1 : 5140, leading to the conclusion that the perch used in the scale bar represents 7¹/₉ yards or thereabouts. The areas quoted in the written survey are consistent with acres based on this value. The positional accuracy of points on the map is found to be ～20 m, and areas of typical plots determined from the map are uncertain by between about 4 and 12%. The relationship between these two facts can be understood through a detailed study of the statistics of the errors in separations of points on the map. The written survey is found to omit a substantial number of plots of land from its listings. The map thus appears to be more reliable overall than the written survey.  相似文献